Chris Bucchere

San Francisco Police are still investigating whether a cyclist who plowed through a crowded crosswalk, killing a 71-year-old man was racing against the clock at the time. Authorities hope the tragedy will help raise awareness of the need for safety, since the city is California’s most hazardous for bikers and pedestrians.

CBS has learned that San Francisco police have obtained videotape of last month’s deadly crash involving an elderly pedestrian and an allegedly speeding cyclist in the city’s Castro District. The news comes as the District Attorney’s Office decides whether to file charges.

Prosecutors are deciding whether to file charges against a bicyclist who struck a pedestrian in a fatal collision in San Francisco’s Castro District last week, and are looking into comments the cyclist appears to have made online after the accident.